Derivative Instruments and Hedging Activities (Schedule of Offsetting Assets and LIabilities) (Details) (Foreign Exchange Forward [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Foreign Exchange Forward [Member]
Offsetting Assets and Liabilities [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 24,768	$ 31,654
Derivative Asset, Fair Value, Gross Liability	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	24,768	31,654
Derivative, Collateral, Obligation to Return Securities	(21,566)	(27,256)
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	3,202	4,398
Derivative Liability, Fair Value, Gross Liability	(34,465)	(35,092)
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	34,465	35,092
Derivative, Collateral, Right to Reclaim Securities	21,566	27,256
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	$ 12,899	$ 7,836